by Elysa Gardner, USA TODAY

by Elysa Gardner, USA TODAY

The singer finally ended weeks of buzz and made it official Tuesday morning, with an appearance on Good Morning America. On Dec. 27, the now 31-year-old former teen star will begin a two-year residency at Planet Hollywood, performing 50 shows over that period.

Spears made the announcement after a live helicopter stunt in Vegas, where she was greeted by more than 1,000 fans. She said that her upcoming show would mix old and new hits, with an atmosphere that's part dance club, part theater.

"We wanted the environment to be that way so people could come and have a good time and stand up and feel like they're in the show with me," Spears said. "I love Vegas. The energy here is really, really good."